[seqfan] Re: A032355 extension

Neil Sloane njasloane at gmail.com
Sat Apr 19 17:34:53 CEST 2014


PS In the main table, http://www.matapp.unimib.it/~spiga/Table.html
the maximal girth and minimal diameter columns
have the same values. Is it a theorem that they are the same, or is this an
error?


On Sat, Apr 19, 2014 at 11:31 AM, Neil Sloane <njasloane at gmail.com> wrote:

> OK, I finished going through that web site. Allan, thanks for finding it!
> I extended A032355 and added a b-file.
>
> There were two existing sequences that they mention, although without
> referencing the OEIS.
>
> A059282 was one of them, and it turns out that had an error,
> which took a while to track down, since all the links were broken. I
> corrected the error and the links and created a b-file.
>
> A003050 is a classic sequence from number theory which also appears in
> their main table (see the Dihedrant column). Their values agree with the
> b-file for that sequence, which is a partial check that their work is
> correct!
>
> Then I also added new sequences A241159-A241165
> (some with b-files) based on their tables.
>
>
>
>
> On Sat, Apr 19, 2014 at 10:54 AM, Wouter Meeussen <
> wouter.meeussen at telenet.be> wrote:
>
>> ok, I stop.
>>
>> W.
>>
>> -----Original Message----- From: Neil Sloane
>> Sent: Saturday, April 19, 2014 4:32 PM
>>
>> To: Sequence Fanatics Discussion list
>> Subject: [seqfan] Re: A032355 extension
>>
>>
>> I did it. I'm working on the other tables in that web site, but there are
>> some problems.
>> To be continued.
>>
>>
>> On Sat, Apr 19, 2014 at 10:23 AM, Wouter Meeussen <
>> wouter.meeussen at telenet.be> wrote:
>>
>>   Somebody should do it:
>>>
>>>>
>>>>>
>>>>  I'm on to it
>>>
>>> Wouter.
>>>
>>> -----Original Message----- From: Allan Wechsler Sent: Friday, April 18,
>>> 2014 9:53 PM To: Sequence Fanatics Discussion list Subject: [seqfan]
>>> A032355 extension
>>> https://oeis.org/A032355 counts the number of graphs (up to isomorphism)
>>> on
>>> 2N vertices that are 3-regular ("cubic") and vertex-transitive.
>>>
>>> It only gives values up to N=20 (V=40). But
>>> http://www.matapp.unimib.it/~spiga/census.html gives values up to V=1280
>>> (N=640), though not in a super-convenient format. It's a complete census
>>> of
>>> all the graphs in question. I pulled out the next ten values (up through
>>> N=30, V=60). I stopped myself from writing a script to pull out all the
>>> values to create a B-file, but I estimate that this is about an hour's
>>> work.  Somebody should do it: I want to see the scatterplot.
>>>
>>> _______________________________________________
>>>
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>>
>>
>> --
>> Dear Friends, I have now retired from AT&T. New coordinates:
>>
>> Neil J. A. Sloane, President, OEIS Foundation
>> 11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
>> Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
>> Phone: 732 828 6098; home page: http://NeilSloane.com
>> Email: njasloane at gmail.com
>>
>> _______________________________________________
>>
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>> _______________________________________________
>>
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>
>
>
> --
> Dear Friends, I have now retired from AT&T. New coordinates:
>
> Neil J. A. Sloane, President, OEIS Foundation
> 11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
> Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
> Phone: 732 828 6098; home page: http://NeilSloane.com
> Email: njasloane at gmail.com
>
>


-- 
Dear Friends, I have now retired from AT&T. New coordinates:

Neil J. A. Sloane, President, OEIS Foundation
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com



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